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MCQs

Total Questions : 186 | Page 3 of 19 pages
Question 21. Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into
  1.    ammonia
  2.    glucose
  3.    ATP
  4.    nitrate
 Discuss Question
Answer: Option A. -> ammonia
Answer: (a).ammonia
Question 22. The groups of symbiotic bacteria, which have the ability to fix nitrogen
  1.    derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen
  2.    grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
  3.    these bacteria are from the genus, Rhizobium
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 23. A heterocyst is
  1.    a type of spore
  2.    a terminally differentiated cell that fixes nitrogen
  3.    the progenitor of cyanobacterial vegetative cells
  4.    a cell that carries out oxygenic photosynthesis
 Discuss Question
Answer: Option B. -> a terminally differentiated cell that fixes nitrogen
Answer: (b).a terminally differentiated cell that fixes nitrogen
Question 24. Nitrogen oxidation (nitrification)refers to the
  1.    conversion of ammonium ions into nitrates through the activities of certain bacteria.
  2.    changing of atmospheric nitrogen (N2) to nitrogen compounds
  3.    sulfur is oxidized to the sulfate form through Thiobacillus bacteria
  4.    none of the above
 Discuss Question
Answer: Option A. -> conversion of ammonium ions into nitrates through the activities of certain bacteria.
Answer: (a).conversion of ammonium ions into nitrates through the activities of certain bacteria.
Question 25. The diagnostic enzyme for denitrification is
  1.    nitrate reductase
  2.    nitrate oxidase
  3.    nitro oxidoreductase
  4.    none of these
 Discuss Question
Answer: Option A. -> nitrate reductase
Answer: (a).nitrate reductase
Question 26. The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?
  1.    Hydrolytic
  2.    Transitional
  3.    methanogenic
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 27. Nitrogen fixation
  1.    changes the free nitrogen (N2) to a form usable by plants
  2.    especially changes nitrogen compounds, mostly amines such as NH2
  3.    both (a) and (b)
  4.    fix the free nitrogen (N2) by which it should not be usable by plants
 Discuss Question
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)
Question 28. Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?
  1.    Achromobacter
  2.    Agrobacterium
  3.    Alcaligenes
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Answer: (d).None of these
Question 29. Some microorganisms have the ability to increase the nitrogen content of soils, are called as
  1.    nitrogen fixation
  2.    denitrification
  3.    nitrification
  4.    all of these
 Discuss Question
Answer: Option A. -> nitrogen fixation
Answer: (a).nitrogen fixation
Question 30. For rapid decomposition by microbes, the substrate should have a C/N ratio of
  1.    10-20
  2.    20-30
  3.    30-40
  4.    60-80
 Discuss Question
Answer: Option C. -> 30-40
Answer: (c).30-40

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